1. Introduction
This manual provides detailed instructions for the safe and efficient operation, installation, and maintenance of your Sunster 8KW 12V Portable Diesel Air Heater. This heater is a volatile evaporation heater independent of the drive system, featuring a direct 12V flow and fully automatic control. It is designed to provide warmth for various diesel vehicles and indoor spaces, ensuring comfort in cold environments down to -40℃. The heater draws in fresh air, heats it through a heat exchanger, and blows it to the desired area. It offers compressibility, light weight, thermal efficiency, energy saving, and easy installation.

Figure 1: Sunster 8KW 12V Portable Diesel Air Heater and included accessories.
2. Safety Information
Please read all safety warnings and instructions carefully before installing and operating this heater. Failure to follow these instructions may result in fire, explosion, electrical shock, or other injuries.
- Ensure proper ventilation when operating the heater, especially in enclosed spaces, to prevent carbon monoxide buildup.
- Do not block the air inlet or outlet. Maintain at least 10 cm clearance around these areas to ensure proper cooling and unblocked airflow.
- Connect the positive and negative main wires securely to the car battery to ensure the normal operation of the main unit.
- Use only diesel fuel with this heater.
- Keep flammable materials away from the heater.
- Do not operate the heater if any part is damaged or malfunctioning.
- Installation should be performed by a qualified professional if you are unsure.
3. Package Contents
Verify that all items listed below are included in your package:

Figure 2: Visual representation of package contents.
- 1 x All-in-one Diesel Heater (with LCD)
- 1 x Remote Control
- 1 x Silencer
- 1 x Mainline Beam (Battery Power Cord)
- 1 x Air Filter
- 1 x Inlet Pipe
- 1 x Outlet Pipe
- 1 x Exhaust Pipe
- 1 x Installation Kit (Fixture Accessories Set)
- 1 x Manual
4. Specifications
| Attribute | Value |
|---|---|
| Brand Name | Sunster |
| Item Type | Heating & Fans |
| Heater Power | 8KW |
| Voltage | 12V |
| Fuel | Diesel |
| Fuel Consumption | 0.16-0.45 (L/H) |
| Tank Capacity | 5L / 1.3 Gal |
| Heater Working Temperature | -40℃~+20℃ / -40℉~+68℉ |
| Oil Pump Working Temperature | -40℃~+20℃ / -40℉~+68℉ |
| Item Weight | 8.3kg |
| Item Length | 42cm (16.54in) |
| Item Width | 21.5cm (6.1in) |
| Item Height | 41cm (16.14in) |
| Air Outlet Pipe Diameter | 76mm |
| Intake Pipe Diameter | 25mm |
| Exhaust Pipe Diameter | 25mm |
| Switch Type | LCD Switch |
| Certification | RoHS, FCC, CE |
| Applications | Trucks, ships, car trailers, RVs, campers, caravans, all other diesel vehicles, home, warehouse, factory, office, and other indoor use. |

Figure 3: Product dimensions and specifications.
5. Installation
Proper installation is crucial for the safe and efficient operation of your diesel air heater. Refer to the diagrams and instructions below.
5.1 Component Overview

Figure 4: Internal components including Motherboard, Ignition Plug, Gasket, Heat Sink, Internal Motor Assembly, and Rubber Band.

Figure 5: Key accessories and their descriptions.
- Motor Assembly: Features a copper core motor, coil winding, and dynamic balance technology for stable rotation and quiet operation.
- Combustion Chamber: Designed for efficient fuel combustion.
- Glow Plug: Essential for initiating combustion.
- Oil Pump: Precisely controls fuel delivery for thorough combustion.
5.2 General Installation Diagram

Figure 6: General installation diagram showing electrical connections and pipe routing.
- The positive and negative main wires must be connected to the car battery to ensure the normal operation of the main unit.
- The air inlet and the air outlet must be reserved for a clearance of about 10 cm to ensure that the air inlet and outlet are cooled and unblocked.
- The oil pump is preferred to be installed between 15°~35° from the horizontal.
- Route the exhaust pipe towards the rear of the car.
5.3 Recommended Installation Locations

Figure 7: Specific installation location suggestions for various vehicle types.
- Truck:
- On the co-driver's legroom.
- On the back wall of the cab.
- Driver's seat backrest.
- Within the tool box.
- RV:
- In front of the passenger seat.
- Between the driver seat and passenger seat.
- Under the container.
- Within the tool box.
- In the trunk.
- 5/7 Seater Vehicles: The heater is mainly installed in the passenger room or baggage room of the vehicle. If it cannot be installed, fix the heater under the underside of the vehicle, but beware of splashing.
- Excavator:
- Inside the driver's seat.
- On the back wall of the cab.
- Inside the protection box.
6. Operation
Your Sunster diesel air heater can be operated via the LCD monitor or the remote control. The heater is designed for low energy consumption, with a fuel consumption rate of 0.16-0.45 L/H. A 5L fuel tank can provide heat for up to 100 hours.

Figure 8: Efficient combustion system for low fuel consumption.
6.1 LCD Monitor Controls
The heater may come with different LCD monitor types. Identify your monitor type and refer to the corresponding controls and features.
A2013 Switch Type LCD Monitor

Figure 9: A2013 LCD Monitor.
- Operation Method: 4 keys
- Key Functions: SET KEY, UP/DOWN, ON/OFF
- Features: Time setting, Pump oil volume setting, Ignition plug power selection, Remote control code, Temperature control conversion (Pump oil volume/temperature), Fuel injectors, Querying Machine Status, Digital panel display, 8 fault codes, Countdown mode timing function.
- Bluetooth APP Function: No
A2172 Switch Type LCD Monitor

Figure 10: A2172 LCD Monitor.
- Operation Method: 4 keys
- Key Functions: ON/OFF, SET KEY, UP/DOWN
- Features: Pump oil volume setting, Ignition plug power selection, Remote control code, Temperature control conversion (Pump oil volume/temperature), Fuel injectors, Querying Machine Status, Digital panel display, 8 fault codes, Voice broadcast.
- Time Setting: No
3-Key Switch Type LCD Monitor

Figure 11: 3-Key LCD Monitor.
- Operation Method: 3 keys
- Key Functions: ON/OFF, UP/DOWN
- Features: Time setting, Pump oil volume setting, Ignition plug power selection, Remote control code, Temperature control conversion (Pump oil volume/temperature), Fuel injectors, Querying Machine Status, Digital panel display, 8 fault codes, Countdown mode timing function.
- Bluetooth APP Function: No
6.2 Remote Control Operation
The remote control allows you to operate the heater from a distance of up to 80 meters (263 feet).

Figure 12: Heater startup methods: LCD panel and remote control.
- Use the remote control to power on/off the heater and adjust temperature settings.
- Ensure the remote control has fresh batteries for optimal range.
6.3 Temperature Control and Timing
- Temperature Adjustment: The LCD monitor provides automatic temperature calibration. The adjustable temperature range is typically 8°C to 35°C (46°F to 95°F).
- Timing Function: Most models include a timing function (countdown mode) allowing you to pre-set heating times. Some models may not have this feature (e.g., A2172).
7. Maintenance
Regular maintenance ensures the longevity and efficient operation of your diesel air heater.
- Cleaning: Periodically clean the exterior of the heater. Ensure air inlets and outlets are free from dust and debris.
- Fuel System: Use clean diesel fuel. Check the fuel filter regularly and replace if clogged.
- Electrical Connections: Ensure all electrical connections, especially to the battery, are secure and free from corrosion.
- Exhaust System: Inspect the exhaust pipe for any blockages or damage.
- Storage: If storing the heater for an extended period, ensure the fuel tank is empty and the unit is clean and dry.
8. Troubleshooting
This section addresses common issues you might encounter with your diesel air heater. For more complex problems, contact customer support.
- Heater not starting:
- Check battery connections.
- Ensure there is sufficient diesel fuel in the tank.
- Verify the ignition plug is functioning.
- Check for any fault codes displayed on the LCD monitor (up to 8 fault codes can be displayed).
- Low heat output:
- Ensure air inlets and outlets are not blocked.
- Check fuel quality and flow.
- Verify temperature settings on the LCD monitor or remote.
- Excessive smoke:
- This may indicate incomplete combustion. Check fuel quality and ensure proper air intake.
- Consult a professional if the issue persists.
- Remote control not working:
- Replace batteries in the remote control.
- Ensure you are within the operating range (up to 80 meters).
9. User Tips
- Altitude Settings: If operating at high altitudes, some controllers may have specific settings for elevation (e.g., in meters or feet). Refer to your specific LCD monitor's advanced settings or consult the full manual for details on adjusting these.
- Pre-heating: For extremely cold conditions, allow the heater a few minutes to pre-heat before expecting full warmth.
- Fuel Quality: Using high-quality diesel fuel can prevent carbon buildup and ensure more efficient operation.
- Ventilation: Always ensure adequate ventilation, especially when using the heater in enclosed spaces like RVs or cabins, to prevent carbon monoxide buildup.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact Sunster customer service. Keep your purchase receipt as proof of purchase.
For more product information and tutorials, visit the official Sunster YouTube channel: https://www.youtube.com/@sunsterofficial